辉长岩骨料全级配碾压混凝土变形性能研究  

Study on the Deformation Performance of Fully-graded Compacted Concrete with Gabbro Aggregates

作　　者：周湘 李志 何金龙 徐海燕 戈雪良[3] ZHOU Xiang;LI Zhi;HE Jinlong;XU Haiyan;GE Xueliang(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,Hunan,China;Huaneng Lancang River Hydropower Co.,Ltd.,Kunming 650209,Yunnan,China;Nanjing Hydraulic Research Institute,Nanjing 210029,Jiangsu,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [2]华能澜沧江水电股份有限公司,云南昆明650209 [3]水利部交通运输部国家能源局南京水利科学研究院,江苏南京210029

出　　处：《水力发电》2024年第4期102-107,共6页Water Power

基　　金：中国华能集团科技项目资助(HNKJ22-H87)。

摘　　要：为了探讨辉长岩骨料应用于全级配碾压混凝土的变形特性,开展了辉长岩全级配碾压混凝土大试件的变形性能(极限拉伸变形、干缩变形、自生体积变形、徐变变形)试验,对变形性能随养护龄期的发展规律以及演变模型进行了研究。研究结果表明:辉长岩骨料全级配碾压混凝土长龄期极限拉伸值在60με~70με范围,极限拉伸值发展率的演变规律符合对数模型;1年期干缩变形处于300με~350με范围,干缩发展率与养护龄期呈对数相关性;1年期自生体积变形值小于-10με,自生体积变形属收缩型,变形值较低;徐变水平与同类工程碾压混凝土相比较低,各龄期下徐变度发展规律符合双曲线发展模型。In order to investigate the deformation characteristics of fully-graded compacted concrete formed by gabbro aggregate,the deformation performances,including the ultimate tensile deformation,dry shrinkage deformation,autogenous volume deformation and creep deformation of large specimens of gabbro fully-graded compacted concrete are tested,and the development law of deformation properties with the age of curing as well as the model for the evolution of deformation properties are investigated.The results show that:(a)the long-age ultimate tensile value of full-graded compacted concrete with gabbro aggregate ranges from 60μεto 70με,and the evolution of ultimate tensile value conforms to the logarithmic model;(b)the one-year-age dry shrinkage of the concrete ranges from 300μεto 350με,and the development rate of dry shrinkage has a logarithmic correlation with the age of curing;(c)the one-year-age autogenous volumetric deformation is less than-10με,and it is the shrinkage type with a low deformation value;and(d)the creep value is lower than that of RCC in similar projects,and the development law of creep degree under each age conforms to the hyperbolic development model.

关 键 词：碾压混凝土重力坝 辉长岩骨料 全级配混凝土 变形性能 演变规律 

分 类 号：TV431[水利工程—水工结构工程]